Pretty print, format, minify, sort keys, and validate JSON data structures online. Instant syntax diagnostics, customizable indentation, and 100% private in-browser processing.
Formatted JSON will appear here...
Debug API payloads, format messy response payloads, and enforce syntax standards.
JSON (JavaScript Object Notation) is the undisputed lingua franca of modern web APIs, configuration files, and database storage. However, working with dense, single-line JSON responses from servers makes inspecting data hierarchies, debugging field values, and catching subtle syntax typos nearly impossible.
The Developers Web Tools JSON Formatter & Validator parses raw data, detects structural syntax errors, and pretty-prints your payloads with custom indentation. You can also minify payloads for high-speed production delivery and recursively sort object keys for clean visual diffing.
Core structural requirements enforced under RFC 8259 specifications.
In valid JSON, all object property keys and string values must be enclosed in double quotes ("key": "value"). Single quotes and unquoted keys will trigger syntax validation errors.
Toggling "Sort Object Keys" alphabetically organizes every nested object key throughout your entire JSON tree, making Git diffing and visual comparison effortless.
Unlike JavaScript object literals, trailing commas after the last item in an array or object are strictly invalid in standard JSON and will be flagged immediately.
Engineered for fast, reliable, and secure JSON data formatting.
Formatting (pretty printing) adds line breaks and indentation (e.g. 2 spaces) to make JSON human-readable. Minifying removes all unnecessary whitespace to compress the payload size for storage or transmission.
Clicking ⇄ Swap places the formatted or minified output back into the input panel, allowing you to quickly test further transformations without manually selecting and re-pasting.
JSON key order is not strictly meaningful in JavaScript, but sorting keys alphabetically makes version control diffs (such as Git commits) clean, reproducible, and easy to review.
No. All parsing, validation, formatting, and minification execute 100% locally in your web browser through native client-side JavaScript. Your data remains completely private.
An error diagnostic banner appears across the top of the workspace showing the exact reason and position of the syntax error (e.g. missing quote, unexpected token, or trailing comma).